Topology-induced confined superfluidity in inhomogeneous arrays

Details Topology-induced confined superfluidity in inhomogeneous arrays Topology-induced confined superfluidity in inhomogeneous arrays

2004-05-21

arxiv.org/abs/cond-mat/0405520v2

Phys. Rev. B 70, 224510 (2004)

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 4 figures, final version

Scientific paper

10.1103/PhysRevB.70.224510

We report the first study of the zero-temperature phase diagram of the Bose-Hubbard model on topologically inhomogeneous arrays. We show that the usual Mott-insulator and superfluid domains, in the paradigmatic case of the comb lattice, are separated by regions where the superfluid behaviour of the bosonic system is confined along the comb backbone. The existence of such {\it confined superfluidity}, arising from topological inhomogeneity, is proved by different analytical and numerical techniques which we extend to the case of inhomogeneous arrays. We also discuss the relevance of our results to real system exhibiting macroscopic phase coherence, such as coupled Bose condensates and Josephson arrays.

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